Improvement in diamond-holders for engraving printers  rollers



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JOHN HOPE, OE PROVIDENCE, RHODE ISLAND, ASSIGNOR TO HOPE OO.,-1OF SAMEPLACE.

Lener; Patent No. 96,591, ma Nomea 9,1869.

IMPROVEBIIEIN'IIK'.I IN DIAMONDLHOLDERS FOR ENG-RAVING PRINTERS ROLLERS.

The Schedule referred to in 'these Letters Patent and making part of thesame.

To all whom it may concern Be it known that I, JOHN HOPE, of the cityandl county of Providence, in the State of Rhode Island, have inventedcertain new and useful Improvements in Diamond-Holders for Use inMachines for Engl-aw furnished, and forming a part of the same, is atrue,-

clear, and exact description thereof, reference being had to thedrawings.

Figure l represents, in plan view, one of my improved diamond-holders` Ais the body of the, holder. Vhen placed in a machine, thc end marked A'is in communication with the lifting-device.

B and C are pivot-fulc-ra, upon' which the. holder is tilted oroperated.

D is a longitudinal slot in the body of the holder, near its outer end.

E is the adjusting-weight, to which the diamondstem is attached.

The weight is accurately fitted to slide in the slot l' longitudinally,and may be secured at any desired point, by means of the thumb-screw F.

Figure 2 represents a holder in elevation view. Similar letters ofreference are used to designate the various parts in all the figures. l

l G is the diamond-stem. The diamond is inserted in the lower end, inthe usual well-known manner.

This stem is secured, by a set-screw, in a socket formed at the outerend of the weight E.

Figure 3 represents, in a cross-vertical section, the slotted end of theholder, the weight E, and diamondstem G.

It will be observed that the outer end of the holder is curved,longitudinally and vertically, in such a manner that the diamond-stem G,whether advanced or `receded, shall, as far as possible, point to thecentre of the roll being engraved, thus rendering the engraved linespractically uniform, so far as relates to the natural cutting-eiect ofthe diamond.

Hcretofore, this curved and slotted end has been used with an adjustablediamond-stem; but as it was moved out from the fulcrum C, it becamenecessary to counterbalance it by means of adjustable weights, placedupon the inner end of the holder designated A.

My improvement is intended to, and does practically accomplish'theadjustment of both stem and vweight by a single operation.

Having thus described my invention,

I claim as new, and desire to secure by Letters Patent- In combinationwith a curved and slotted diamondholder, the curved weight, fittedthereto, and connected with the diamond-stem G, substantially as shownand described.`

JOHN HOPE.

W'itnesses:

ORVILLE PECKHAM, EDWARD C. AMES.

